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Bosch SL1501B dishwasher doesn't drain water after the washing cycle. Also with new drain pump. What else could it be?

Sorry for my English, I'm writing from Italy. :-) I have a Bosch SL1501B dishwasher. After the washing cycle, lots of water remains in the bottom: the drain pump seemed to not work properly so I changed with a new one, that works better: I made the dishwasher drain in a bucket and during the cycle it fills it almost twice. But after the washing cycle, the water on the bottom is still there. Then I have to manually lift the mushroom-shaped float and wait that it slowly drains all the water off the dishwasher. What else could it be?

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Check the following.
1. The drain hose has to be discharging at a high enough point to prevent water flowing back into the machine.
2. Make sure your drain hose is not twisted or kinked.
3 . Make sure your drain line is not blocked push a flexible hose down it to dislodge any fat/debris
4.If your drain line discharges into a shared drain with another appliance i.e. garbage disposal make sure it is not blocked.
5. You may have a blockage at the inlet to the pump which would slow down the pumping rate,
Since you mentioned the mushroom shaped float allowing the washer to empty this may be defective.
See the link attached.
Hope this helps.
Crofter

Bosch Dishwasher Does Not Drain

Posted on May 06, 2015

Testimonial: "Thank you for your helpful answer! I completely disassembled the drain hose and it was twisted (didn't see it, it was hidden), and it cumulated fat stuff on that point, reducing the flow quite a lot. Thanks again for your help!"

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Posted on Jan 02, 2017

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